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Explain what a convolutional neural network (CNN) could be used for in NLP. Output:
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A convolutional neural network (CNN) can be used in NLP for tasks such as text classification, language modeling, question answering, and sentence similarity. CNNs enable the capture of local, short-term patterns in a text sequence and can help identify meaningful sources of information for language understanding tasks, such as sentence-level sentiment classification and sentence chunking for syntax analysis.